Portable Ultra-thin Diamond Sharpening Stone 150*63*1mm Honeycomb Surface Whetstone Knife Sharpener Kitchen Grinding Tool Name: Ultra-thin Sharpening Stone size: about 150 * 63 * 1mm weight: about 70g only Coated Side: 1000 # material: adamas Function: Kitchen Sharpener feature: 1. Small size, light weight, easy to carry. 2. Unique surface Honeycomb Design. 3. Use for: For knife / planer / chisel / scissors etc. 4. It is only 1mm thick so will not take up much space and can be fixed on any flat surface.